Safety device



March 12, 1929. R. McC. JOHNSTONE 1,705,120

SAFETY DEVICE 4 Sheets-Sheet 1 Filed Oct. 1, 1927 M81611 1929- .R. we.JOHNSTONE' SAFETY DEVICE 4 Sheets-Sheet 2 Filed Oct. 1, 192'? March 12,l929. R. MCC. JOHNSTONE SAFETY DEVICE Filed Oct. 1, 192'? 4 Sheets-SheetWW xala't A TTORNEY March 12, 1929. R. we. JOHNSTONE SAFETY DEVI CEFiled Oct. 1, 1927 4 Sheets-Sheet 4 A TTORNEY,

Patented Mar. 12, 192

STTES PATENT OFFICE.

0 ROBERT MCC. JOHNSTONE, 0F ROSELLE PARK, NEW JERSEY, ASSIGNOR TOCAMERON MACHINE COMPANY, 01* BROOKLYN, NEW YORK,

A CORPORATION OF NEW YORK.

SAFETY DEVICE.

Application filed. ()ctoher 1, 1927. Serial No. 223,315.

This invention relates generally to safety devices and has moreparticularly reference to safety devices to be employed in connectionwith wind ng machines.

The main object and 't'eature of the invention is to provide meanswhereby the rotation of the l'i'iachine will of itself automaticallythrow the safety device into protective position.

In the accompanying drawings the invention is shown in a concrete andpreferred form in which Fig. l a view in section largely iliagrammatic,ot parts (it a winding machine embodying one tom ol the invention.

Fig. 2 is a detaii View w. n parts broken away and in section looking inthe direction ot' arrow 2 of Fig. 1.

Fig. 1' is a view similar to Fig. l with the parts ot the saiciy levieeoccupy ng a nonprotective position.

Fig. 4 is a. detail sectional view su ally on the plane ht lin ot Fig. 5a view similar ing a modified form of the invenlzoo.

Fig. 6 is a detail view of some ot the parts ot Fig. 5 and showing theguard in protective position.

Fig. 7 is a, sectional view substanti: lly on the plane of line 7 i ol'F (3.

Fig. 8 is a hen-izontai sectional view substant ally on the plane o'tline fi -t of Fig. 7.

Tl-e machine seleeted t'or illui ration and to which the invention maybe applied is, in the present, instance. a winding machine provided witlfront. and rear winding drums A and l; and with a winding shat: C onwhich material I) is tittlllfllllilttll by tt'rictional engagem nt withthe drums. ()wing to the fact that the rotation of the parts is in thedirection indicated a grave danger exists that the operator of themachine may be caught in the nip between the drum and the woundmaterial. To obviate this danger a guard member 1 is provided to shieldthe nip between the drum and wound material, and, in the presentinstance, this guard member is mounted on two arms 2 that are pivoted atpoint 3. A suitable motor element is provided whereby said guard memberwill auton'iatically move into protective position, and a simple motorelement for this purpose would be a means for normally urging the guardinto protective position. Such means may take many forms but are hereshown as a counterweight 4-. There are times when the operator must haveaccess to the nip, as when cleaning the machine, and a suitable latch 5is therefore provided by means of which the guard member may be held innon-protective position. The specific means here used are as follows:latch is provided with two arms that are pivoted at (3 on arms 2 of theguard member, and said latch is biased to fall when the guaro member isdepressed as shown in Fig. 3 and to insure that it will always fall tothe left in the illustration a keeper l0 provided against which pin 9will be stopped it the latch should attempt to cross over its deadcenter. The latch is preterably provided with material 12 similar tothat used for b 'ake linings.

It will. now be seen that when the guard is depressed into thenon-protective position shown in Fig. 3 latch 5 will bear against amovable part of the machinery, here the hub or shaft of one of therotatable drums. So long as the drum remains at rest the guard will heheld by the latch. but when the drums begin rotation the latch will beautomatically released and weight 4 will move the guard into protectiveposition.

A suitable stop pin 11 on the guard member may be used to limit thedownward movement of the latch, and a stop pin 13 in the framework ofthe machine may be used to limit the upward movement of the guardmember.

In Figs. 5 to 7 is shown a modified form of the invention in which theguard takes the form of a reciprocatory member eonsisting here of a wirescreen 20 supported by two vertically extending T-bars 21 that slidablyengage a plurality of sets of rotatable guide rollers 22. The motorelement that moves the guard into protective position consists here ofcounterweights 26 carried by flexible connections 24 that pass oversheaves or pulleys 25, said connections being secured to the lower endof the guard member. It will be seen from the above construction thatcounterweights 26 normally tend to urge the guard member upwardly orinto protective position to shield the nip between the front. windingdrum and the accumulated material on the winding shaft, the extent ofthis movement being limited by a suitable stop as 27 which comes againstone of the guide-rolls 22. The latching means are, in this instance,constructed as follows: 28 indicates two arms or bell cranks pivotallysupported at 28" on the framework, said arms being provided at one endwith a pivotally supported latch 29. At the other end of arms 28 ispivotally carried a counterweight 29 that tends to move arms 28 down tothe right (Fig. so as to permit latch 25) to turn on its pivot andengage the hub of A when the guard has been depressed. So long as themachine is at rest the parts will remain in this position, but, whendrum A begins to rotate, latch 29 will be released and the guard memberwill rise into protective position. One advantage of this constructionis that if the hand of the operator should be adjacent the nip, it willbe thrown upward and outward by the rising guard member or gate.

I claim:

1. The (JOII'lbllltltltHl with a winding machine having a surfacewinding drum and a winding shaft to receive wound material that engagesthe surface of the winding drum, a pivotally supported guard member toprotect the nip between the drum and wound material, means to urge theguard member, in a given direction on its pivot, into protectiveposition, and a latch to cngage a movable part of the winding machine tohold the guard member in non-protective position so long as the movablepart is at rest but automatically released upon movement of said movablepart.

2. The combination with a Winding machine having a surface winding drumand a winding shaft to receive wound material that engages the surfaceof the Winding drum, a pivotally supported guard member, to protect thenip between the drum and wound material, a latch to engage a movablepart of the winding machine to hold the guard membe' in non-protectiveposition so long as the movable part is at rest but automaticallyreleased upon movement of said movable part, and means to automaticallymove the 'uard member into protective posiiion upon release of thelatch.

3. The combination with a winding machine having a surface winding drumand a winding shaft to receive wound material that engages the surfaceof the winding drum, a guard member to protect the nip between the drumand wound material, means to urge the guard member into protectiveposition, and a pivotally supported latch to engage a rotatable part ofthe winding machine to hold the guard member in non-protective positionso long as the rotatable part is at rest but automatically released uponrotation of said rotatable part.

Signed at Brooklyn in the county of ,1, city of New York, and State ofNew York, this 12' day of Sept. 1927.

ltt llllfilt'l McU. JOHNCTONE.

